Properties of the Number 945

Nine Hundred Forty-Five

Basics

Value: 944 → 945 → 946

Parity: odd

Prime: No

Previous Prime: 941

Next Prime: 947

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 5 × 7

Divisors: 1, 3, 5, 7, 9, 15, 21, 27, 35, 45

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1110110001

Octal: 1661

Duodecimal: 669

Hexadecimal: 3b1

Square: 893025

Square Root: 30.740852297878796

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Double factorial of odd numbers: a(n) = (2·n-1)!! = 1·3*5*...*(2·n-1). A1147

Number of partitions of n into relatively prime parts. Also aperiodic partitions. A837

Double factorials n!!: a(n) = n·a(n-2) for n > 1, a(0) = a(1) = 1. A6882

a(n) = n*(n+3)/2. A96

Numbers k that divide the (right) concatenation of all numbers <= k written in base 25 (most significant digit on left). A29470

Numbers that are the sum of 2 positive cubes. A3325

Odd abundant numbers (odd numbers m whose sum of divisors exceeds 2m). A5231

Triangular array: the fusion of (x+1)ⁿ and (x+2)ⁿ; see Comments for the definition of fusion. A193722

Generalized 10-gonal numbers: m*(4·m - 3) for m = 0, +- 1, +- 2, +- 3, ... A74377

The convolution matrix of the double factorial of odd numbers (A001147). A35342